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Dear Readers, Today I’m going to reach into my mailbag to answer the top 5 questions I’ve received in the last month about running an air conditioner from an inverter in your RV. You can watch me on video by clicking the screenshot, or read a transcription of my Q&A’s below. 1. Do you have any updates on whether it’s possible to run a rooftop air conditioner from a 2,000-watt inverter? Yes I do know more, but my experiments have shown that a stock 15,000 BTU Dometic Penguin II air conditioner draws too much surge current at compressor startup to be able to operate reliably from a 2,000-watt inverter. If you’re going to be running a stock RV air conditioner you’ll probably require a 3,000-watt inverter just to handle the 50+ ampere starting surge. However, if you install a SoftStartRV controller, you should be able to run your air conditioner from a 2,000-watt inverter, just as I have. 2. I have a 3,000-watt inverter with a Lithium battery, but it’s still shutting down when trying to start my rooftop air conditioner. It acts like the battery is shutting off. What’s up? Many Lithium batteries have a peak current threshold set somewhere between 200 and 250 amperes of current. That sounds like a lot of current, but if you remember from my HRDL study on air conditioner surge current, a typical air conditioner compressor draws over 50 amperes of current during startup. That equates to 500 amperes of current from […]